Automatic force or suction draft.



PATENTED APR. 28, 1908.

G. s. STUART. AUTOMATIC FORGE 0R SUCTION DRATT.

APPLICATION FILED NOV. 27, 1907.

a sums-sum '1.

' wi tmeowa PATENTED APR. 28, 1908'.

I G. S. STUART. AUTOMATIC FORGE OR SUCTION DRAFT.

APPLICATION FILED NOV. 27, 1907.

3 SHEETS-SHEET 2.

PATENTED APR. 28, 1908.

G. s STUART. AUTOMATIC FORGE OR SUGTION DRAFT.

APPLIOATION FILED NOV. 27; 1907.

3 SHEETS-SHEET GEORGE S. STUART, Ol HOLLIDAYSBL'RG. PENNSYLVANIA.

AUTOMATIC FORCE OR SUCTION DRAFT.

No. ssazce.

Specification of Letters Patent.

. Patented April 28, 1908.

Application filed November 27, 1907. Serial No. 404,11b.

To all whom it may concern:

Be it known that I, GEORGE S. STUART, a citizen of the United States, residing at Hollidaysbur in the county of Blair and State of Pennsy vania, have invented certain new and useful Im rovcments in Automatic Force (Ir-Suctionrafts; and I do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in the art to'which it appertains to make and use the same.

My invention relates to improvements in automatic force or suction drafts, and the object of my invention is to )rod uce a simple device of this character whic i can be applied to a-flue of an ordinary room stove ort-o any flue or stack, either of a locomotive or a stationary engine, or in fact at any place where it is desired to produce'a forced draft or to clean a flue. It is also applicable for various other uses, as for examp e, in a planing mill it may be used to force the sawdust and shavings out through a pipe. The device may be worked by hand or power, as preferred.

' With these objects in view, my invention consists in the construction and combina vtions of parts as hereinafter described and claimed.

In the accompanying draWingS Figure. 1 is aside view of a cook stove and flue, showing my invention applied thereto. Fig. 2 is a side view of my invention, parts being broken away, ap lied to an ordinary flue, on a larger scale. Fig. 3 is a cross section of a large flue, showing my invention applied thereto. Fig. 4 is a perspective view of the slide for cutting off the moving parts from the rest of the flue. Fig. 5 shows-the hub for holding the vanes. Fig. 6 is a vertical cross section of the device shown in Fig. 2. Fig. 7 is a side view, artly broken away, showing the means for ocking the wheel in any desired position. Fig. 8 is a cross section on the line 9-U of Fig. 7, and Fig. 9 is a side elevation of the weighted balance wheel.

(1 represents an ordinary cook stove and l) the flue thereof.

My invention can be ap )lied to any ordinary flue by cutting away t ie back and rivetin the invention around the sides of the cut.

'ly invention comprises a casing c and a half wheel (I, that is to say, a number of vanes e mounted in a hub 15 on a shaft fbut leaving half of the wheel open so as not to impede the draft in the flue under ordinary conditions. This wheel can also he used as a damper, as hereinafter described.

In the form shown in Figs. 1, 2, 3 and 6, this wheel d is driven by means of a crank handle g, attached to a skeleton wheel It provided with teeth i on the outside. The teeth '11 mesh with teeth on a small pinion wheel k mounted on a stu -shaft Z, secured in the cars ing a by means of a bracket 122. On the shaft 1 is mounted another toothedwheel n, which gears with a pinion on the shaft Obviously by rotating the handle g through the connections described, the shaftf carrying a half wheel at will be rotated, causing a strong current up through the flue b. This can be used either to increase the draft'in the stove or to clean out the flue, as desired. The shaft f runs through the casing c, and on the end opposite the crank handle carries a weighted wheel p provided with a weight g, the purpose of which is to bring the parts back into the position shown in Fig. 3 when the handle 2 is raised. The weight g also has another function, and that is to hold the wheel in the position shown in 3, this weigFt being substantially equal to the vanes 6. he vanes e are preferably curved, as shown in Fig. 3. These vanes are inserted in slots 25 in the hubs 15. A wire 26, bent at the ends, is preferably used, passing through the vanes e, to stiffen the structure like an ordinary sliding damper. The wheel d can also be used as a damper, if desired, and can be set in an position by the following means, which are best shown in Figs? and 8:On the shaft j'is mounted a wheel 1-, which is provided with grooves s on its circumference at intervals. This wheel is splined to the shaft f. On the extension t of the shaft f-is mounted a second. wheel u rovided with a slot 1) on its peri hery, and a o provided with a pro-, jecting iandle w which acts as a we' ht to normally swing the slot '0 nearly to the ottoin.

0: represents a pawl provided with toothgd head y and an operating handle 2. Thispawl is mounted on a pivot pin. 1 in a bracket *2 attached to the casing c.

The operation of this form of the device is as follows :When it is desired to produce a draft in the stove, the pawl w is turned by means of the handle 2' so that it will entirely disenga e thenvheels r and u, whereupon the outer w eel it drops until its handle is at'the lowest possible position. I The outer wheel it is a little larger than the inner'wheel 1,50

. ing a that if the pawl a; is accidentally thrown back I so that its point 'y touches the wheel 1/. it will be kept out of engagement with the wheel r. The wheel d is then rotated by means of the handle 9. A strong draft is produced through the flue and, therefore,throu h the stove. If it is desiredto have the w eel (1 act as a damper, the wheel or disk u is turned until the slot o therein will engage the hook 3 on the pawl, and the handle then turned until one of the slots in the wheel 1" registers with the slot e, whereupon the end y of the pawl drops into the notches and holds the entire apparatus against rotation.

Referring now to Figs. 3 and 4, it is sometimes desirable to cut the wheel d'off from the main flue, in order to prevent .dirt from collecting in the. wheel, and this is done by means of a curved slidable partition 3 adapted to slide in a slot 4, as shown in Figs. 3 and 4.

Of course, a pulley could be applied to the shaft of the wheel 72. and the apparatus driven by power, if desired.

1 claim.

- 1. The combination of a flue or stack hav ing a cut-awa portion, and aforce draft device adg pte to be fitted around said cutaway portion, and having a shaft provided 'thcurvedvanes extending only part way around said shaft, forming a partialwheel,

andmeans for rotating said shaft, substan tially as described. a p p 2. The combination of a flue or stack having a cut-away portion, and a force draft device adapted to-be fitted around said cutaway portion and havin a shaft provided with curved vanes exten ing ap roximately.

half way around said shaft, an means for rotating said shaft, substantially as described.

3. The combination of a flue or stack havipart cut away, with a casing adapted to be tted around said cut-away portion, a shaft journaled in said casing, a series of removable curved vanes fastened to said shaft and extending approximately half way around it, and means carried by, saidcasing for rotating said shaft, substantially as described.

4. The combination of a flue or stack having acut-away portion, with a force draft dedevice including fitted around said cut-away portion, ashaft vice consisting of a casing adapted to'be fitted around said cut-awayv portion, a shaft mounted in said casing and provided with curved vanes, said-vanes extending only part Way around said'shaft, and means for locking said shaft in any position whereby said 'v'anesmay be caused to act as a damper, sub- .stantiallyas described. 5. The combination of a flue or stack having a cut-away portion, with a, force draft a casing adapted to .be

mounted in said-casing and provided with a plurality of vanes extendin about half Way around said shaft, means or rotating said shaft, and adjustable devices for fastening said shaft in any desired position,- substantially as described. a

6. The combination of a fine orstack havv mg a adapted to be fitted around the cut-away ortion, said device consisting of a casing, a shaft mounted in said casing, vanes on said shaft extending approximately half way around said shaft, and a movable partition ada ted to be slipped in front of said wheel to c ose up the opening in said flue or stack, substantially as described.

7. The combination of a flue having a cutaway portion, and a force draft device including a casing adapted to fitaround said cut-away portion, a shaft mounted in said casing, vanes on said shaft extending part cut-away, a force draft device half way around same to form a half-wheel,

means for rotating said shaft, and a balance wheel-on said shaft, substantially as described.

8. A force draft device ada ted to be fitted on to an ordinary flue anr consisting of a casing, a shaft jonrnaled insaid casing and provided with curved vanes extending about half way around said shaft, and thereby forming a half-wheel, means for rotating said shaft, and a balance wheel on said shaft having a weighted portion oppositely located with respect to said vanes, t iereby balancing said wheel, substantially as described. v '9. A .balancedraft device ada ted to be attached to an ordinary fine, 8.1M includinga casing, a shaft mounted therein and having curved vanes attached thereto about half" way around said shaft, thereby forming a half Wheel, means for rotating said shaft, a

weighted wheel attached to said shaft, near its end, to balance said vanes, and means forlocking said wheel in any desired position, substantially as described. i

10. The combination of a flue having a cut-away portion, and a force draft device adaptedto be secured thereto, and. including a casing adapted to besecured to a shaft mountedin said casing and provided with vanes, and means for locking said shaft in any desired position, said means including two wheels or disks rovided with slots, one of said wheels being keyed to said shaft and the other-being loosely mounted thereon, and a pawl for engaging the slots in said wheels, substantially as described.

, In testimony whereof, I affix'my signa ture, in presence of two witnesses. I GEORGE S. STUART.-

I Witnesscs:

GEO. B. lir'rs, A. W. NEALE, Jr.

said flue,

llf) 

